Noise Dual Filter

Noise and Dual Filter module

The Oakley Noise and Dual Filter module is used to generate non pitched sounds such as wind, surf and other ethereal sounds. It can also be used as a sound source for percussive sounds like cymbals and snare drums.

Two types of noise output are provided.
•White noise which when unfiltered sounds like gas escaping,
•Pink noise which sounds more like a big waterfall.

The module's pink noise circuitry comprises of a complex cascade network designed to replicate the -3dB/octave low pass response that true pink noise requires.

The module also gives a very low frequency output or infra-red signal. This can be heard as a series of random thumps when listened too, but it is actually a randomly varying output voltage changing all the time, sometimes quickly and sometimes hardly at all.
Fascinating to watch when it controls an LED, but it comes into its own when controlling filter cut-off on an otherwise static sound.

This module also features two separate and quite unusual voltage controlled one pole filters; one high pass and one low pass. A one pole filter produces a gentle -6dB/octave roll off for natural sounding noise effects. These are internally normalised to the noise generator's output, but may also be used separately to process other sound sources too.

The two filters are both voltage controlled so the cut off frequency may be controlled by an external CV signal from, perhaps, an ADSR, LFO or midi-CV converter. A front panel pot and three way switch allows you to control the depth of the modulation for either or both filters. The pot is a 'reversible attenuator, so you are able to control not only the depth of the modulation but also the polarity. The noise source is true analogue, a reverse biased PNP transistor.
Price £170 GBP

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